e...@math.uni-bonn.de (Edgar =?iso-8859-1?B?RnXf?=) writes:
>> and by writing the full disk (or parity blocks) you may cause
>> additional errors.
>I don't get that.
You replace disk contents with something else.
Think about when you have to check parity. Usually that's after a crash
that might have damaged data. The same thing (e.g. memory corruption)
could hit you when you rewrite the parity, and from a few bad blocks you
quickly go to "whole parity information is bad" without even knowing
about it.
Verifying parity (and fixing up errors) is less risky.
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Michael van Elst
Internet: mlel...@serpens.de
"A potential Snark may lurk in every tree."
